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Amateur Television. Glossary Frame Frame Single PictureSingle Picture Field Field ½ Picture½ Picture Interlaced Interlaced Draws ½ Picture then draws.

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Presentation on theme: "Amateur Television. Glossary Frame Frame Single PictureSingle Picture Field Field ½ Picture½ Picture Interlaced Interlaced Draws ½ Picture then draws."— Presentation transcript:

1 Amateur Television

2 Glossary Frame Frame Single PictureSingle Picture Field Field ½ Picture½ Picture Interlaced Interlaced Draws ½ Picture then draws the second halfDraws ½ Picture then draws the second half

3 Glossary Interlace Interlace

4 Broadcast TV Bandwidth Bandwidth 6MHz6MHz

5 Broadcast TV 525 Lines per frame 525 Lines per frame 262 ½ Lines per field262 ½ Lines per field 30 Frames per second 30 Frames per second Full motion videoFull motion video

6 Amateur Television Types of ATV Types of ATV SSTVSSTV Slow Scan Television Slow Scan Television FSTVFSTV Fast Scan Television Fast Scan Television

7 Slow Scan TV Single frame of video Single frame of video Scan convert a frame to audio then transmit the audioScan convert a frame to audio then transmit the audio Recent happeningsRecent happenings Web Cams and Video capture cheap Web Cams and Video capture cheap Use sound card to generate tones Use sound card to generate tones Rig Blaster, BuxComm interfaces Rig Blaster, BuxComm interfaces Freeware/Shareware software Freeware/Shareware software

8 Fast Scan TV Usable Frequencies Usable Frequencies 70cm70cm First ham band that is wide enough to allow full 6MHz bandwidth First ham band that is wide enough to allow full 6MHz bandwidth Standard Frequencies Standard Frequencies 421.25 MHz421.25 MHz 426.25 MHz426.25 MHz 427.25 MHz427.25 MHz 434.00 MHz434.00 MHz 439.25 MHz439.25 MHz

9 Fast Scan TV Usable Frequencies Usable Frequencies 33cm 902 – 928 MHz33cm 902 – 928 MHz 23cm 1240-1300 MHz23cm 1240-1300 MHz 13cm 2390 – 2450 MHz13cm 2390 – 2450 MHz

10 70cm FS ATV Station Requirements Station Requirements ReceiveReceive Television Receiver Television Receiver Channel 57 (421.25MHz)Channel 57 (421.25MHz) Channel 60 (439.25MHz)Channel 60 (439.25MHz) Down Converter Tuner Down Converter Tuner

11 70cm FS ATV Station Requirements Station Requirements TransmitTransmit Video Source Video Source CamcorderCamcorder CameraCamera Audio Source Audio Source MicrophoneMicrophone Transmitter Transmitter Off the ShelfOff the Shelf Commercial EquipmentCommercial Equipment Home BrewHome Brew

12 70cm FS ATV Station Requirements Station Requirements AntennaAntenna Horizontal Polarization Horizontal Polarization Operator Requirements Operator Requirements Technician ClassTechnician Class

13 70cm FS ATV Off the Shelf Equipment Off the Shelf Equipment PC ElectronicsPC Electronics TC70-20S TC70-20S Synthesized 4 Channel TransmitterSynthesized 4 Channel Transmitter 20 W Output 20 W Output Built in Tuner/Down ConverterBuilt in Tuner/Down Converter Video, Audio, MIC, and PTL InputsVideo, Audio, MIC, and PTL Inputs $549$549

14 70cm FS ATV Commercial Equipment Commercial Equipment Cable ModulatorsCable Modulators Need 25 KHz steps Need 25 KHz steps Blonder Tongue (Agile Modulator) Blonder Tongue (Agile Modulator) Video, Audio InputsVideo, Audio Inputs Low Power OutputLow Power Output Will require an amplifier Will require an amplifier Typically available on eBayTypically available on eBay Running around $50 last year Running around $50 last year Significantly higher recently Significantly higher recently

15 70cm FS ATV Home Brew Equipment Home Brew Equipment PC ElectronicsPC Electronics Individual pieces Individual pieces Power AmpsPower Amps ModulatorsModulators Down ConverterDown Converter 4ATV.com4ATV.com 13cm and 23cm equipment 13cm and 23cm equipment MFJMFJ Micro ATV Micro ATV

16 70cm FS ATV Transmission Distance (Miles) Transmission Distance (Miles) Ant.GainDipole8dBd16dBd Dipole3.4821 8dBd82153 16dBd2153133

17 70cm FS ATV Local Usage Local Usage RepeatersRepeaters WA2PJP/R WA2PJP/R Located on Bald Hill in SeldenLocated on Bald Hill in Selden 434.00MHz Input 421.25MHz Output434.00MHz Input 421.25MHz Output Talkback 144.34MHz or 144.37 MHzTalkback 144.34MHz or 144.37 MHz W1NRE/R W1NRE/R Located in Southern CT.Located in Southern CT. 426.25MHz Input 439.25MHz Output426.25MHz Input 439.25MHz Output Talkback 144.34MHzTalkback 144.34MHz Currently Off the AirCurrently Off the Air Power Problems Power Problems

18 70cm FS ATV Local Usage Local Usage OperatorsOperators WA2PJP – Joe (Wednesday 8PM) WA2PJP – Joe (Wednesday 8PM) WA2FNQ – Jerry (Wednesday 8PM) WA2FNQ – Jerry (Wednesday 8PM) W1CTC – Bob (Wednesday 8PM) W1CTC – Bob (Wednesday 8PM) W2OTA – Mike (Nightly 7PM) W2OTA – Mike (Nightly 7PM)

19 ATV Links PC Electronics PC Electronics www.hamtv.comwww.hamtv.comwww.hamtv.com ATV Research ATV Research www.atvreasearch.comwww.atvreasearch.comwww.atvreasearch.com Directive Systems Directive Systems AntennasAntennas www.directivesystems.comwww.directivesystems.comwww.directivesystems.com www.icircuits.comwww.icircuits.comwww.icircuits.com

20 ATV Links Intuitive Circuits Intuitive Circuits Video Overlays, Character GeneratorsVideo Overlays, Character Generators www.icircuits.comwww.icircuits.comwww.icircuits.com Connecticut – Long Island ATV Connecticut – Long Island ATV www.ctliatv.orgwww.ctliatv.orgwww.ctliatv.org Southern CT Amateur Radio Assn Southern CT Amateur Radio Assn www.wa2fnq.hamradios.com/scara.htmwww.wa2fnq.hamradios.com/scara.htm


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